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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69cdd157dfd8a018fd06f439804a482613a4b1f3aa2d614207d66ad6e56d4c8' 
  AND token = '9UxBVNTD+gaGHyzluWlYmlqdZlrWTN1g6ymukq4VJQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}